Experimental measurements of supermodes in superposition architectures for coherent laser beam combining

Mercedeh Khajavikhan, Kerstin John, James R. Leger

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Measurements of the modal properties of Michelson resonators are compared to theory using a common-path generalized Michelson resonator. Conventional Michelson cavities are shown to exhibit significant loss when path length errors are introduced, often resulting in reduced output power. Accurate measurements of these losses as a function of path length error are provided, along with measurements of the field distribution in the resonator. Proper exploitation of spatial and longitudinal supermodes is shown to reduce the path length sensitivity in coherent beam combining systems. In particular, modifying a conventional Michelson resonator to include an additional mirror reduces path length error losses and increases output power. Measurements of the modal performance of these cavities compare well with theoretical expectations.

Original languageEnglish (US)
Article number5475387
Pages (from-to)1221-1231
Number of pages11
JournalIEEE Journal of Quantum Electronics
Issue number8
StatePublished - 2010

Bibliographical note

Funding Information:
Manuscript received December 02, 2009; revised March 02, 2010; accepted March 03, 2010. Current version published May 26, 2010. This work was supported by Cymer, Inc.


  • Coherent beam combining
  • High power fiber laser
  • Mode analysis


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